Anomalous superperiodicity in scanning tunneling microscope images of graphite
作者:
M. Kuwabara,
D. R. Clarke,
D. A. Smith,
期刊:
Applied Physics Letters
(AIP Available online 1990)
卷期:
Volume 56,
issue 24
页码: 2396-2398
ISSN:0003-6951
年代: 1990
DOI:10.1063/1.102906
出版商: AIP
数据来源: AIP
摘要:
An anomalously large periodicity has been observed in scanning tunneling microscope images of a (00.1) graphite sample. The unusual contrast has hexagonal symmetry, a periodicity of 7.7±0.2 nm and is superimposed on the usuala=0.246 nm atomic spacing of graphite. Current‐voltage curves recorded in the scanning tunneling spectroscopy mode from the region showing the superperiodicity exhibit slightly more metallic behavior than those from neighboring normal regions. One possible explanation for the observed periodicity is that it is a rotational moire´ pattern resulting from the overlap between a misoriented layer of graphite and the underlying graphite single crystal.
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